Chain-machine splitter-bit.



PATENTED APR. 17, 1906.

'1. S. HARDESTY.

CHAIN MACHINE SPLITTER BIT.

APPLICATION FILED NOV. 6, 1905.

a M M W 0% Wit-meme) A56 Gram/m THORNTON S. HARDESTY, OF RIVESVILLE, WEST VIRGINIA.

CHAIN-MACHINE SPLITTER-BIT.

Specification of Letters Patent.

Patented April 17, 1906.

Application filed November 6, 1905. Serial No. 286,052.

To all 1071 0777 it vnay concern:

-Be it known that I, THORNTON S. HAR- DESTY, a citizen of the United States, residing at Rivesville, in the county of Marion and State of WVest Virginia, have invented certain new and useful Improvements in Chain- Machine Splitter-Bits, of which the following is a specification.

My invention relates to an improved bit for coal-mining machines, and has for its ob-- ject the provision of a device of this character constructed in such manner as to mine the coal with the least possible rupture of the same, whereby the coal, and particularly bituminous coal, when finally delivered for use will be in lumps of considerable size instead of being pulverized.

A further object of the invention is the provision of a bit for coal-mining machines constructed in such manner that the bit will not become dulled as quickly as those now in use, thereby reducing the amount of blacksmithing required to keep such bits in condition and likewise avoiding the loss of time occasioned by the necessity of frequently removing the bits from the machine in order to sharpen them.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawings, Figure 1 is a plan view of a traveling chain, showing my improved bit secured thereto. Fig. 2 is a side elevation of one of my improved bits having its cutting-pointdisposed at an an gle. Fig. 3 is a side elevation having its outting-point disposed at an opposite angle to the angle of the cutting-p oint shown in 2. Fig. 4 is an edge view of the bit shown in Fig. 2. Fig. 5 is an edge view of the bit shown in Fig. 3. Fig. 6 is a side elevation of the parts shown in'Fig. 1. Fig. 7 is a detailed view illustrating the manner in which my improved bit cuts into a seam of coal, and Fig. 8 is a front elevation of a bit constructed in ac cordance with the invention.

Like numerals designate corresponding parts in all of the figures of the drawings.

The hereindescribed bit is particularly adapted for use in coal-mining machines wherein a traveling chain is employed, which carries a plurality of bits for mining the coal.

Referring to the drawings, the numeral 5 designates such a traveling chain composed of the links 6 and 7. Carried by the links 6 are blocks 8. These blocks are disposed at varyingangles to the chain and are adapted to receive the shanks 9 of bits 10, 11, and 12. These bits comprise the shanks 9 and a cutting portion 13, which are wider upon their front face 14 than upon their rear face 15. The ends or cutting edges 16 of the bits are curved, as is best illustrated in Fig. 7.

The method of mounting the bits in the chain forms no part of the present invention. It is in the construction of the bit that the present invention resides, and it is in the construction of the cutting portion of the bit that the invention particularly resides.

In Fig. 7 one of the bits is shown cutting into a seam of coal, (indicated by the numeral 17.) By referring to said figure it will be seen that the rounded and sharpened cutting edges of the bit enter the seam of coal to a considerable extent before the front face of the bit enters said coal. Where a bit in which the front face enters the coal before any other portion of the device is used the result is to break the coal into small pieces. The point of said cutting-bit repeatedly becomesdulled and as it is dragged through the coal ruptures the same to such an extent as to decrease its value commercially. The cutting portions 13 of the bits are formed at an angle with the shank portions 9 in a horizontal plane, as illustrated in Figs. 2 and 3, and are also bent at an angle to said shank portions in a vertical plane, as is illustrated in Figs. 4, 5, and 6. This results in the cutting edges of the bits being offset with relation to each other when they are finally secured in the traveling chain 5 and results in a wider out being made than would be the case if the cutting edges of all of said bits were directly in line with each other.

With a bit such as is herein described it is possible to make longer cuts without sharpening said bits than has been possible with any of the devices now in use.

Having described my invention, what I claim is 1. A bit for coal-mining machines, having a shank portion and a cutting portion, said cutting portion lying at an angle with the shank portion and having its front face Wider than its rear face and also having a sharp, curved cutting edge adapted to enter the coal ahead of said faces.

2. A bit for coal-mining machines comprising a shank portion and a cutting portion lying at an angle to said shank portion in a In testimony whereof I afliX my signature horizontal plane and also lying at an angle to in presence of two Witnesses. said shank portion in a Vertical plane, the

front face of said cutting portion being Wider THORNTON HARDESTY' 5 than the rear face thereof, said cutting por- Witnesses:

tion having a sharp, curved cutting edge E. F. MORGAN,

adapted to enter the coal ahead of said faces. 1 h IAYAfNT CASWALL. 

